VANIMEDAT project : Decadal and interdecadal sea-level variability in the Mediterranean sea and northeastern Atlantic ocean A. Pascual 1, M. Marcos 2,

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VANIMEDAT project : Decadal and interdecadal sea-level variability in the Mediterranean sea and northeastern Atlantic ocean A. Pascual 1, M. Marcos 2, S. Ruiz 1, D. Gomis 1, S. Monserrat 1, E. Alvarez 3, B. Pérez 3, M. G. Sotillo 3, G. Larnicol 4, M. N. Tsimplis IMEDEA (CSIC-UIB), Balears, SPAIN, 2 NOC, National Oceanographic Center, Southampton, UK 3 Puertos del Estado, Madrid, SPAIN 4 CLS Space Oceanography Division, Toulouse, FRANCE 1. Objectives of VANIMEDAT project GENERAL OBJECTIVE: Study of decadal and interdecadal sea-level variability in the seas surrounding the Iberian peninsula. (Project funded by the Spanish Ministry of Science and Education) SPECIFIC OBJECTIVES: a) Characterization of the spatial and temporal sea-level variability. b) Quantification, at a regional scale, of the different mechanisms that drive sea- level variability. c) Estimation of ocean mass increase. Tide gauge data:  Hourly and monthly data.  Period:(~ ).  Tides are filtered and atmospheric correction (IB/MOG2D/HAMSOM) is applied. Barotropic sea level models: HAMSOM MOG2D Baroclinic model: to be run in the framework of VANIMEDAT project. 2. Data and models 3. Preliminary results GRACEGOCE MODEL INTERCOMPARISON ( ) mean = 5.63 mm/yr mean = 2.90 mm/yr Configuration of the barotropic models. SEA LEVEL TRENDS FROM ALTIMETRY TIDE GAUGES VS ALTIMETRY ( ) 4. Ongoing and future work ZONEHAMSOMMOG2D ALL ATL WMED ADR ZONEHAMSOMMOG2D ALL ATL WMED ADR ZONEHAMSOMMOG2D ALL ATL WMED ADR mean = 5.39 mm/yr mean = 5.48 mm/yr Barotropic sea level variance from each model. HAMSOM MOG2D Ratio of variance reduction at tide gauges ([Var(TG-IB)-Var(TG-model)]/Var(TG-IB), in %, for all frequencies (left), LF (>20 days, centre) and HF (<20 days, right). ZONEHAMSOM(%)MOG2D(%) ALL ATL WMED ADR Left: Dubrovnik tide gauge (blue) and altimetry (red) time series corrected by HAMSOM (top) and MOG2D (bottom). Right: Ratio of variance reduction of the differences between altimetry and tide gauge ([Var(TG-alti)| model -Var(TG-alti )|]/ Var(TG-alti)| IB. HAMSOMMOG2D Spatial Res. 1/6º lat 1/4º lon km Temp Res1 h6 h Period present RegionMed/NEAtlGlobal Atmosph. Forcing REMO (NCEP/NCAR) 6 h ECMWF 6 h TIDE GAUGE VARIANCE REDUCTION ( ) ALTI_MOG2D ALTI_MOG2D ALTI_HAMSOM ALTI_IB MOG2D HAMSOM TP Altimetry data: Along-track processing:  Atmospheric correction: (IB/MOG2D/HAMSOM)  Usual other corrections Objective analysis:  Long wavelength error corrected.  Weekly maps, 1/4º.  Period: 1993-present (Top) Position of gauges (hourly data) used for the comparison with altimetry. Jason ERS-1/2 ENVISAT Combination of tide gauge and altimetry data to reconstruct sea level in the last century. Characterization of heat fluxes from REMO. To run a baroclinic numerical model to extract the steric component. Use of GRACE and GOCE data to extract the mass component.